超临界反应堆子通道流动传热数值分析  

CFD ANALYSIS OF THERMAL-HYDRAULIC BEHAVIOR OF SUPERCRITICAL WATER IN SUB-CHANNELS

作　　者：顾汉洋[1] 程旭[1] 杨燕华[1] 

机构地区：[1]上海交通大学核科学与工程学院,上海200240

出　　处：《工程热物理学报》2008年第3期429-433,共5页Journal of Engineering Thermophysics

基　　金："973"项目(No.2007CB209804);上海交通大学青年教师启动基金资助

摘　　要：目前国际上对超临界水冷堆进行了大量的研究,但对其堆芯内超临界流体流动传热的认识还十分欠缺.本文采用CFX对超临界水冷堆典型子通道内的流动传热特征进行了CFD研究,对比分析了四边形和三角形布置的两类子通道流动传热特征。计算结果表明二阶SSG湍流模型能较好地模拟子通道内的超临界流体流动和传热特征.流动特征的分析表明四边形子通道内的二次流比三角形子通道内的复杂,强度也更大。两类子通道内的湍流脉动特征类似,当栅距较小时其间隙处的湍流交混系数都在0.02-0.025之间。四边形子通道的周向温度和换热不均匀性比三角形子通道的强烈.Investigations on the thermal-hydraulic behavior in the SCWR fuel assembly have obtained a significant attention in the international SCWR community. However, there is still a lack of understanding and ability to predict the heat transfer behavior of supercritical fluids. In this paper, CFD analysis is performed to study the thermal-hydraulic behavior of supercritical water flows in two typical types of sub-channels in SCWR, i.e. square and triangular lattices. The results show that the secondary flow in a square lattice is much more complex and stronger than that in a triangular lattice. The turbulent characteristics in the two lattices are similar. The turbulent mixing coefficient in gap region falls in the range from 0.02 to 0.025. The non-uniformities of the circumferential wall temperature and heat transfer in a square lattice are much stronger than those in a triangular lattice.

关 键 词：超临界水冷堆 子通道 传热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]